Fix bug that crept in d8cd05b7

parent fac4e3c3
......@@ -97,7 +97,7 @@ public class SSRVisitor extends VisitReturn<Object> {
if (isFieldAccess(x)) {
PrimSig s = getFirstPrimSig(x.left);
if (!(s.builtin || isUsedInOpen(s)))
candidates.put(s, true);
candidates.putIfAbsent(s, true);
}
}
else {
......
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